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A372615
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Number of regions among all distinct circles that can be constructed from the 3 vertices and the equally spaced 3*n points placed on the sides of an equilateral triangle, using only a compass.
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8
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7, 121, 624, 2368, 7912, 17115, 38461, 63184, 115614, 170149, 285715, 371982, 588043
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OFFSET
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0,1
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COMMENTS
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A circle is constructed for every pair of the 3 + 3*n points, the first point defines the circle's center while the second the radius distance.
The vertices of the initial equilateral triangle are indicated by small circles in the illustrations here.
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FORMULA
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CROSSREFS
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KEYWORD
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nonn,more
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AUTHOR
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STATUS
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approved
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